It's definitely not solved from a technical perspective but it's really hard to compete in a business perspective. The market wants good fast search. If you com

It's definitely not solved from a technical perspective but it's really hard to compete in a business perspective. The market wants good fast search. If you come up with great fast search, it's still hard. The only opportunity I see from the business perspective is to challenge the visual paradigm. Having said that, there are tons of opportunities from the academic perspective such as inferring context, letting users control context, etc.